Fix avatar and display name update issues

- Remove avatar handling from profile update to prevent overwriting DB with display URL
- Skip ensureParent for .avatars to speed up upload
- Add change detection for display name save button
- Update API client to not send avatarUrl in profile update

go_cloud/internal/http/routes.go

@@ -3872,7 +3872,6 @@ func updateUserProfileHandler(w http.ResponseWriter, r *http.Request, db *databa
 	var req struct {
 		DisplayName *string `json:"displayName"`
 		Email       *string `json:"email"`
-		AvatarURL   *string `json:"avatarUrl"`
 	}
 
 	if err = json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -3895,11 +3894,6 @@ func updateUserProfileHandler(w http.ResponseWriter, r *http.Request, db *databa
 		args = append(args, *req.Email)
 		argIndex++
 	}
-	if req.AvatarURL != nil {
-		setParts = append(setParts, fmt.Sprintf("avatar_url = $%d", argIndex))
-		args = append(args, *req.AvatarURL)
-		argIndex++
-	}
 
 	if len(setParts) == 0 {
 		// No fields to update
@@ -3927,9 +3921,6 @@ func updateUserProfileHandler(w http.ResponseWriter, r *http.Request, db *databa
 	if req.Email != nil {
 		metadata["email"] = *req.Email
 	}
-	if req.AvatarURL != nil {
-		metadata["avatarUrl"] = *req.AvatarURL
-	}
 
 	auditLogger.Log(r.Context(), audit.Entry{
 		UserID:   &userID,